A Dice roller would be a great option for the Role Playing section, I added such a feature to a forum I Administrated and it was quite interesting. The legitimacy of the roles however, is not something I am sure of.
If I remember right, if you edit the post it re-rolls. While this prevents cheating it can be bothersome if you need to edit content within the post. That was my experience, and it was with a single roller so I can't judge accurately on this matter.
However I would like to see one implemented.